52 JOHN B. SMITH. 



line, but usually broken on t. j). line so as to form one quadrate 

 patch. Front as before. 



Areli is pale to the middle of the wing for its full width, is then 

 dark outwardly, except for a quadrate, white costal patch toward 

 apex. The front is flat, scarcely convex aiid not at all roujih. By 

 its even division through the middle, this species is readily distin 

 guished. It is also a little larger than its immediate allies. 



Erastroides is altogether different from the species with which it 

 is here associated ; but, indeed, it does not closely resemble any other 

 of this genus. The primaries are rather short and broad, the outer 

 margin rounded, so that in wing form the species stands by itself. 

 And that the dark shading, though broad on the inner margin, is 

 terminated below the costa so that this is white to the apex, and the 

 difference from all others in this immediate series is obvious. 



In the remainder of the species the head and thorax are entirely 

 white. 



Quadriplaga resembles biplaga in color, wing form and in the 

 two quadrate, wliite costal patches in each wing. But it is dis- 

 tinctly smaller and the secondaries have a yellowish tinge. 



Schwarzii and arlda are forms in which the dark shading starts 

 on the internal margin within the middle, extends obliquely to the 

 reniform, then runs parallel with the costa nearly to the s. t. line 

 where it breaks .s(|uarely to the costa. A dusky shading from the 

 costa at the t. p. line tends to and often does cut off a quadrate 

 white patch. Even when it does not, the sijuare termination of the 

 white gives the impression of such a spot. 



Schwarzii is the larger of the species, and the dark shadings are 

 smooth, glossy steel-gray. This dark shading invades the base, but 

 is indefined. The front is rough and a little protuberant. 



Arida is a brighter, more definitely marked species. The dark 

 shadings are olive-gray, and a yellow tinge seems to pervade the 

 wing without being definitely localized. The course of the yellow- 

 ish s. t. line is characteristic, forming a prominent, acute, upward 

 tooth opposite the anal angle. The front is smooth and only a little 

 convex. 



In all the remaining species the base is white or creamy to or 

 beyond tiie middle, though it may be clouded with gray or crossed 

 by gray lines. Usually the gray shading begins on the inner mar- 

 gin at or beyond the middle and curves toward the apex, reach- 

 inw the <'i)sta at or about the s. t. line. Sometimes it includes the 



